2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/33724For dynamical systems of dimension three or more the question of integrability or nonintegrability is extended by the possibility of chaotic behaviour in the general solution. We determine the integrability of isotropic cosmological models in general relativity and string theory with a variety of matter terms, by a performance of the Painlevé analysis in an effort to examine whether or not there exists a Laurent expansion of the solution about a movable pole which contains the number of arbitrary constants necessary for a general solution.Research announcement, 2 pages, submitted for publication in the MG9 ProceedingsGeneral Relativity and Quantum Cosmologytext